wow mate im impressed,I have done a 240 conversion using a Harley Breakout back wheel which I think is 8x18 using a Pirelli Diablo tyre.
I had to change the bearings, disc and pulley, I made my own brake caliper bracket and used a R6 front caliper. Just working on the front conversion now for the matching wheel 21x130
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that looks good ..
Are you only going to run a single disc on the front .did you have to modify the swing much.